Qiskit / qiskit-terra / 5788874643

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Fix multiple nested custom controlled gates in QPY (#10537) (#10578)

* Fix multiple nested custom controlled gates in QPY

When a circuit contained multiple custom controlled gates that in turn
had custom definitions, the QPY serialisation could fail to write out
some of the inner instructions correctly.  This led to an invalid QPY
file that could not be read back.

* Remove local warning-suppression import

(cherry picked from commit 06416d7ee)

Co-authored-by: Jake Lishman <jake.lishman@ibm.com>

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